text: #include <errno.h>
  #include <signal.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <sys/select.h>
  #include <sys/wait.h>
  
  
  static volatile int handler_called;
  
  static void
  handler (int sig)
  {
    handler_called = 1;
  }
  
  
  static int
  do_test (void)
  {
    struct sigaction sa;
    sa.sa_handler = handler;
    sa.sa_flags = 0;
    sigemptyset (&sa.sa_mask);
  
    if (sigaction (SIGUSR1, &sa, NULL) != 0)
      {
        puts ("sigaction failed");
        return 1;
      }
  
    sa.sa_handler = SIG_IGN;
    sa.sa_flags = SA_NOCLDWAIT;
  
    if (sigaction (SIGCHLD, &sa, NULL) != 0)
      {
        puts ("2nd sigaction failed");
        return 1;
      }
  
    if (sigblock (sigmask (SIGUSR1)) != 0)
      {
        puts ("sigblock failed");
        return 1;
      }
  
    int fds[2][2];
  
    if (pipe (fds[0]) != 0 || pipe (fds[1]) != 0)
      {
        puts ("pipe failed");
        return 1;
      }
  
    fd_set rfds;
    FD_ZERO (&rfds);
  
    sigset_t ss;
    sigprocmask (SIG_SETMASK, NULL, &ss);
    sigdelset (&ss, SIGUSR1);
  
    struct timespec to = { .tv_sec = 0, .tv_nsec = 500000000 };
  
    pid_t parent = getpid ();
    pid_t p = fork ();
    if (p == 0)
      {
        close (fds[0][1]);
        close (fds[1][0]);
  
        FD_SET (fds[0][0], &rfds);
  
        int e;
        do
  	{
  	  if (getppid () != parent)
  	    exit (2);
  
  	  errno = 0;
  	  e = pselect (fds[0][0] + 1, &rfds, NULL, NULL, &to, &ss);
  	}
        while (e == 0);
  
        if (e != -1)
  	{
  	  puts ("child: pselect did not fail");
  	  return 0;
  	}
        if (errno != EINTR)
  	{
  	  puts ("child: pselect did not set errno to EINTR");
  	  return 0;
  	}
  
        TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3));
  
        exit (0);
      }
  
    close (fds[0][0]);
    close (fds[1][1]);
  
    FD_SET (fds[1][0], &rfds);
  
    kill (p, SIGUSR1);
  
    int e = pselect (fds[1][0] + 1, &rfds, NULL, NULL, NULL, &ss);
    if (e == -1)
      {
        puts ("parent: pselect failed");
        return 1;
      }
    if (e != 1)
      {
        puts ("parent: pselect did not report readable fd");
        return 1;
      }
    if (!FD_ISSET (fds[1][0], &rfds))
      {
        puts ("parent: pselect reports wrong fd");
        return 1;
      }
  
    return 0;
  }
  
  #define TEST_FUNCTION do_test ()
  #include "../test-skeleton.c"
  